/Engine/Source/Runtime/Engine/Public/Curves/IKeyFrameManipulator.h
Attempt to find a key using a custom predicate
The key's handle if found, or an empty container if not
[TOptional](API\Runtime\Core\IO\TOptional)< [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) > FindKey ( [TimeTypeRef](API\Runtime\Engine\Curves\IKeyFrameManipulator\TimeTypeRef) KeyTime, [TimeTypeRef](API\Runtime\Engine\Curves\IKeyFrameManipulator\TimeTypeRef) KeyTimeTolerance ) const